We (2 adults) stayed for a week. The place was clean and conveniently located near very good street eating in the small back streets and 10 mins walk to the BTS and a firm but comfortable bed.
However, it was a bit uncomfortable for 2 people to be in during the day as there was no comfortable seating to read books, unless you lay on the bed. The pool area only had a few wooden bench seats so that was not ideal to sit and read in either.
There were no teabags provided, just instant coffee which we don't drink, and no pool towels until I asked for some. The pool was not particularly inviting so a separate towel is essential. We did not put our heads into the water though as the pigeons drinking from the water did not give me much confidence in the pool water quality.
Because it is an apartment block, there is quite a lot of noise from neighbours coming and going, especially the clicking of heavy double locks on doors early in the mornings.
It would be fine for just a few days stay if you are going out daily as the price of the apartment is very reasonable and the eating choices nearby are fantastic, as is the massage place at the end of the street.